import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int price = console.nextInt();
        int cost = 0;

        //write your code here......
        if(price >= 100 && price < 500){
            cost = (int)(price * 0.9);
        }else if(price >= 500 && price < 2000){
            cost = (int)(price *0.8);
        }else if(price >= 2000 && price < 5000){
            cost  = (int)(price * 0.7);
        }else if(price >= 5000){
            cost  = (int)(price * 0.6);
        }else{
            cost = price;
        }


        System.out.println(cost);
    }
}
